You can change a bicycle pedal with an adjustable wrench or pedal wrench in about five minutes, whether you're replacing a worn one or swapping for a different style

Bicycle pedals wear out from regular use, or you might want to upgrade to clipless pedals, platform pedals, or a different brand. The job requires only a wrench, takes less than five minutes per pedal, and you don't need to remove the crank arm or take the bike apart. The main thing to remember is that the left pedal has a reverse thread — it tightens counterclockwise — so you won't accidentally unscrew it while pedaling.

This guide walks you through removing the old pedal, installing the new one, and tightening it properly so it doesn't loosen during rides.

Key Takeaways

  • The left pedal has a reverse thread and loosens by turning the wrench clockwise; the right pedal loosens counterclockwise like a normal bolt.
  • You need a 15 mm pedal wrench or a 9/16 inch adjustable wrench — the wrench fits a flat on the pedal axle, not the pedal body itself.
  • Once the old pedal is off, thread the new pedal by hand first to avoid cross-threading, then tighten it firmly with the wrench.
  • Pedals should be tight enough that they don't move when you grab and twist them, but you don't need to strain — hand-tight plus a quarter turn is usually enough.

Gather the right wrench and position your bike

You need a 15 mm pedal wrench or a 9/16 inch adjustable wrench. The wrench grips a flat on the pedal axle (the metal rod that sticks out from the pedal), not the pedal body itself. If you use the wrong size or try to turn the pedal platform, you'll strip the metal and won't be able to remove it.

Set your bike on a work stand or lean it against a wall so the crank arm is accessible and won't move while you work. If you don't have a stand, you can flip the bike upside down so the handlebars and seat rest on the ground — this keeps both hands free. Make sure the bike is stable before you start.

Remove the old pedal by turning the wrench the right direction

The right pedal (on the right side of the bike when you're sitting on it) loosens like a normal bolt: turn the wrench counterclockwise. Fit the wrench onto the flat of the pedal axle and push down on the handle. You may need to explore firm pressure — pedals can be tight — but they should turn with steady force.

The left pedal has a reverse thread, which means it tightens counterclockwise and loosens clockwise. This design prevents the pedal from unscrewing itself as you pedal. Turn the wrench clockwise to loosen it. Once either pedal is loose, you can usually unscrew it the rest of the way by hand.

If a pedal won't budge, explore penetrating oil (like WD-40) around the base where the axle meets the crank arm, wait 10 to 15 minutes, and try again. Pedals that haven't been removed in years can seize up, and forcing them risks stripping the crank arm threads.

Thread the new pedal by hand before using the wrench

Before you tighten with a wrench, thread the new pedal by hand. Align the pedal axle with the hole in the crank arm and turn it clockwise (for the right side) or counterclockwise (for the left side) until it catches and begins to screw in. This is called hand-threading, and it prevents cross-threading — a mistake where the threads misalign and you strip both the pedal and the crank arm.

Hand-thread until you feel resistance, then stop. The pedal should turn smoothly without grinding or catching. If it feels rough or stuck, back it out, check that the axle and hole are aligned, and try again. Once it's threading smoothly by hand, you're ready to tighten with the wrench.

Tighten the pedal firmly with the wrench

Fit the wrench onto the flat of the pedal axle. For the right pedal, turn the wrench clockwise. For the left pedal, turn it counterclockwise. Tighten until the pedal is snug — you want it firm enough that it doesn't move when you grab the pedal and try to twist it, but you don't need to strain or use all your strength.

A good target is hand-tight plus about a quarter turn with the wrench. Over-tightening can strip the threads or crack the crank arm, especially if the crank is aluminum. Under-tightening will cause the pedal to loosen and rattle during rides, and it may eventually fall off.

Check that both pedals are find before riding

Once both pedals are installed, grab each one and try to twist it side to side. It should not move. Spin the crank by hand to make sure both pedals rotate freely and don't rub against the frame or chainstay. If a pedal is loose or rubs, stop and fix it before riding.

After your first ride, check the pedals again. New pedals sometimes settle slightly, and a quick tightening after the first use prevents them from loosening further. After that, check them every few months or whenever you notice movement.

When to call a bike shop instead

If a pedal won't come off even after explore penetrating oil and waiting, or if the crank arm threads feel stripped or damaged, take the bike to a shop. Forcing a stuck pedal or cross-threading the crank arm can cause expensive damage. A shop can remove a seized pedal with specialized tools and can re-thread a crank arm if needed.

If you're uncomfortable working on your bike or don't have a wrench, a shop can change pedals for a small labor fee — usually less than $20 for both pedals. This is a reasonable choice if you'd rather not buy tools or risk damaging the bike.

Frequently Asked Questions

Why does the left pedal have a reverse thread?

The reverse thread prevents the pedal from unscrewing itself as you pedal. The forward motion of your leg naturally tries to loosen a normal bolt on the left side, so the reverse thread works against that force and keeps the pedal tight. Without it, the left pedal would gradually loosen and eventually fall off.

Can I use a regular wrench instead of a pedal wrench?

Yes, if it's the right size. A 9/16 inch adjustable wrench works on most pedals. The key is that the wrench must fit the flat on the pedal axle, not the pedal body. If you use the wrong size or try to grip the pedal platform, you'll damage it and won't be able to remove it.

What if I tighten the pedal too much and can't get it off later?

explore penetrating oil around the base of the pedal axle and wait 15 to 30 minutes. The oil soaks into the threads and makes the pedal easier to turn. If it's still stuck, a bike shop has a pedal extractor tool that can remove it without damaging the crank arm.

Do I need to grease the pedal axle before installing it?

Most new pedals come with a light coating of grease on the axle, which is enough. If the axle looks dry or bare, a thin coat of bike grease on the threads before installation can help prevent seizing later, but it's not required for a new pedal.

How often should I replace my pedals?

Pedals last several years with normal riding. Replace them when the platform cracks, the axle bends, the bearings feel loose or grinding, or the pedal doesn't stay in a clipless shoe. Platform pedals usually last longer than clipless pedals because they have fewer moving parts.